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Author: Smartweigh–Multihead Weighter
With the improvement of the regulations for continuous and accurate metrological verification of raw materials, especially solid raw materials, in the whole process of industrial production, multihead weigher emerges from time to time. It is based on the change of the net weight of raw materials on the scale body. It has replaced the original electronic belt scales, spiral scales, and even accumulative scales. As a new and upgraded measurement and verification method, it has been more and more widely used in metallurgy, mining, chemical plants, and chemical fiber manufacturing industries. The weighing platform, the loading bin and all the machines and equipment that function on the weighing platform are used as the entire weighing body of the multihead weigher. The sensor continuously transmits the net weight change on the weighing body to the multihead weigher control instrument. The net weight elastic coefficient of the scale body per unit time is used as the specific instantaneous total flow. Then compare with the set overall target total flow, and output 4-50mA current data signal after PID calculation to change the output frequency of the soft starter of the feeding motor, and then change the speed ratio of the motor to make the specific feeding amount as small as possible. Close to the set overall target total flow to achieve the purpose of accurate feeding.
In order to complete the continuous feeding of the multihead weigher and the accuracy of the measurement verification, the top of the feeding silo must be equipped with a large hopper that can continuously feed the material and a fully automatic gate valve to control the feeding. Set up an upper limit value for feeding and a lower limit value for feeding in the control instrument. When the control instrument weighs the net weight on the scale to reach the lower limit value for feeding, a data signal to open the feeding gate valve will be sent out. Open the gate valve, the raw material of the large hopper will be put into the upper silo according to the conductive soft connection, and the net weight on the scale body will increase. When the control instrument weighs the net weight on the scale body to the set upper limit value for feeding, a data signal to close the gate valve will be sent out to close the gate valve.
When the feeding time is over, the multihead weigher automatically restores the real-time control, that is, controls the feeding motor according to the data signal transmitted by the sensor. The whole process of the operation of the multihead weigher is so cyclical.
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